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    <title>topic CPU Utilization Question in Virtual Machine, Guest OS and VM Tools Discussions</title>
    <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402204#M41866</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi, I have a 4 host ESX 3.5 environment with DRS and HA running. The hosts are blades in an HP BL25 enclosure. They have 2 dual core AMD Opteron 1.8ghz Processors and all are loaded with 16gb of memory. One of my VM's shows it's average CPU usage as 96%. The host that this VM is running is only using 27% of the CPU for the host. So it is weird that the VM's CPU is pegging but it looks like there is more then enough CPU available on the host?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;This VM is a Windows 2003 server that is running some security camera software which records and collects data on a separate RDM attached to this VM. I am wondering if there is anything I can try to get the CPU usage to go drop? We have about 25 VM's total on the 4 hosts. We do not use resource pools at all.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Any help would be great.&lt;/P&gt;&lt;P&gt;Thanks.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Thu, 23 Oct 2008 12:48:45 GMT</pubDate>
    <dc:creator>tow-eric</dc:creator>
    <dc:date>2008-10-23T12:48:45Z</dc:date>
    <item>
      <title>CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402204#M41866</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi, I have a 4 host ESX 3.5 environment with DRS and HA running. The hosts are blades in an HP BL25 enclosure. They have 2 dual core AMD Opteron 1.8ghz Processors and all are loaded with 16gb of memory. One of my VM's shows it's average CPU usage as 96%. The host that this VM is running is only using 27% of the CPU for the host. So it is weird that the VM's CPU is pegging but it looks like there is more then enough CPU available on the host?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;This VM is a Windows 2003 server that is running some security camera software which records and collects data on a separate RDM attached to this VM. I am wondering if there is anything I can try to get the CPU usage to go drop? We have about 25 VM's total on the 4 hosts. We do not use resource pools at all.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Any help would be great.&lt;/P&gt;&lt;P&gt;Thanks.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 12:48:45 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402204#M41866</guid>
      <dc:creator>tow-eric</dc:creator>
      <dc:date>2008-10-23T12:48:45Z</dc:date>
    </item>
    <item>
      <title>Re: CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402205#M41867</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;how many vCPU's does teh VM have configured ?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;if the VM has only 1 vCPU then it will only be able to use the Equivilant of 1 cpu and will not start using an accumulation of all cpu's on the host. &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 12:58:50 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402205#M41867</guid>
      <dc:creator>happyhammer</dc:creator>
      <dc:date>2008-10-23T12:58:50Z</dc:date>
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      <title>Re: CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402206#M41868</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Currently it only has 1 vCPU. I was told that most of the time 1 vCPU would be fine and that only VM's that can utilize more then 1 proc will benefit from changing to 2 or 4 vCPU's? Should I try changing this to 2 vCPU's?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt; Thanks.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 13:02:34 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402206#M41868</guid>
      <dc:creator>tow-eric</dc:creator>
      <dc:date>2008-10-23T13:02:34Z</dc:date>
    </item>
    <item>
      <title>Re: CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402207#M41869</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Actually, this doesn't sound like a vCPU issue - the application is using 96% of the CPU assigned to it and this works out to 27% CPU usage on the host server.  I'd upgrade to 2vCPUs only if there is documentation that shows that the application benefits from 2 CPUs.  Otherwise, I'd look into why the application requires so much processing power.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt; &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt; &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 13:05:22 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402207#M41869</guid>
      <dc:creator>mikepodoherty</dc:creator>
      <dc:date>2008-10-23T13:05:22Z</dc:date>
    </item>
    <item>
      <title>Re: CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402208#M41870</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Forgot to ask - was this server built as a Virtual Server or convereted from a physical server/?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;If it was converted, then I suggest checking to make sure the process was reset to a single processor under device manager and checking to see if any non-used hardware (phantom hardware) still is seen in device manager - if so, cleaning up the phantom hardware and updating the processor information to single processor whould help.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 13:11:32 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402208#M41870</guid>
      <dc:creator>mikepodoherty</dc:creator>
      <dc:date>2008-10-23T13:11:32Z</dc:date>
    </item>
    <item>
      <title>Re: CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402209#M41871</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;This was built as a VM. I just changed the vCPU to see if that will have any affect. Luckily not to many people are using this yet, so I will have some room to shut it down when I want for the next few days.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt; &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 13:13:28 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402209#M41871</guid>
      <dc:creator>tow-eric</dc:creator>
      <dc:date>2008-10-23T13:13:28Z</dc:date>
    </item>
    <item>
      <title>Re: CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402210#M41872</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Hello tow-eric,&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Keep in mind that when you use 2 vCPUs that VM's processing time must be scheduled on two physical cores simultaneously. This means that when the 2 vCPU VM is processing, the other VMs on the system are left with only 2 cores to work with. &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Like others have said, only do 2 vCPU VM's if the application can genuinely benefit from it. It is much harder on a Windows machine to go back to a single CPU HAL than it is to go forward to a multi-CPU HAL. I hope this helps. &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Don't forget to use the buttons on the side to award points if you found this useful (you'll get points too).&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Regards,&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Harley Stagner&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 14:28:28 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402210#M41872</guid>
      <dc:creator>hstagner</dc:creator>
      <dc:date>2008-10-23T14:28:28Z</dc:date>
    </item>
    <item>
      <title>Re: CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402211#M41873</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;It is odd because ever since I moved it to 2 vCPU's the usage has stayed between 50% - 70% and hasn't pegged yet.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;So are you saying if I wanted to go back and change it to 1 vCPU to see if it spikes again, the OS would have issues with it?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt; &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 14:35:28 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402211#M41873</guid>
      <dc:creator>tow-eric</dc:creator>
      <dc:date>2008-10-23T14:35:28Z</dc:date>
    </item>
    <item>
      <title>Re: CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402212#M41874</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;IF you go back to 1 vCPU, you would need to update the processor information in device manger to roll that back to single processor or you will have issues.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt; Don't be surprized is the utilization pegs occassionally - that's normal.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;If it goes back up to 96% all the time, then I'd be concerned.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 14:58:30 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402212#M41874</guid>
      <dc:creator>mikepodoherty</dc:creator>
      <dc:date>2008-10-23T14:58:30Z</dc:date>
    </item>
    <item>
      <title>Re: CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402213#M41875</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;What would I need to updated in device manager? I think I have rolled back to 1vCPU before and never did anything in device manager?&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 15:01:58 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402213#M41875</guid>
      <dc:creator>tow-eric</dc:creator>
      <dc:date>2008-10-23T15:01:58Z</dc:date>
    </item>
    <item>
      <title>Re: CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402214#M41876</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Hello tow-eric,&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Have a look at &lt;A href="http://vmware-land.com/Converter.html"&gt;this guide for using VMware Converter&lt;/A&gt; .  At the end there is a section called "What should I do after I successfully convert my virtual machine". In this section, it goes over replacing the HAL. I hope this helps.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Don't forget to use the buttons on the side to award points if you found this useful (you'll get points too).&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Regards,&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Harley Stagner&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 15:14:55 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402214#M41876</guid>
      <dc:creator>hstagner</dc:creator>
      <dc:date>2008-10-23T15:14:55Z</dc:date>
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    <item>
      <title>Re: CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402215#M41877</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&amp;amp;gt; So are you saying if I wanted to go back and change it to 1 vCPU to see if it spikes again, the OS would have issues with it?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I don't see where you identified what process in the VM is causing the CPU spike in the first place.  What specific process is spiking the usage in task manager?  I suspect you could have a virus...  &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 17:15:51 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402215#M41877</guid>
      <dc:creator>RParker</dc:creator>
      <dc:date>2008-10-23T17:15:51Z</dc:date>
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    <item>
      <title>Re: CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402216#M41878</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;The process is the application the server is using for recording video and storing it. No roque processess or anything.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I haven't tried reverting back to 1vCPU, but will and let you know the results.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Thanks.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt; &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 17:34:17 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402216#M41878</guid>
      <dc:creator>tow-eric</dc:creator>
      <dc:date>2008-10-23T17:34:17Z</dc:date>
    </item>
    <item>
      <title>Re: CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402217#M41879</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&amp;amp;gt; I haven't tried reverting back to 1vCPU, but will and let you know the results.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;don't forget the HAL!  Going from 1 CPU to 2 CPU is easy, plug and pray will take care of that, however, going from multi to uni hal is somewhat of a chore.. you have to right click the driver and choose one and HOPE it will detect you can use uni.. if it doesn't.. well that's an entire thread unto itself.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt; &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt; &lt;A href="http://support.microsoft.com/kb/299340" target="test_blank"&gt;http://support.microsoft.com/kb/299340&lt;/A&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 17:38:54 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402217#M41879</guid>
      <dc:creator>RParker</dc:creator>
      <dc:date>2008-10-23T17:38:54Z</dc:date>
    </item>
    <item>
      <title>Re: CPU Utilization Question</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402218#M41880</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Just changed it back to 1 vCPU and changed the processor to Uni. Everything came back fine. But now the CPU is back being pegged. So it looks like 2 vCPU's it is!&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt; &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 23 Oct 2008 17:46:54 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/CPU-Utilization-Question/m-p/2402218#M41880</guid>
      <dc:creator>tow-eric</dc:creator>
      <dc:date>2008-10-23T17:46:54Z</dc:date>
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